Tektronix K1297-G20 - Manual (Page 168)

Appendix B: Keyboard
B-10 K1297-G20 Monitor User Manual
Deactivating an External Mouse
If you connected an external mouse and you want to use the trackball
again, proceed as follows:
1. Shut down and switch off the device.
2. Disconnect the mouse from the serial port.
3. PC-3 board only: Switch the device on and make sure that the
trackball is enabled in the PC BIOS as described above (section
Switcing the Trackball Off or On). If you forget this step, there will be
no pointing device at the next start of Windows XP; press
<CTRL> + <ALT> + <Delete> on the keyboard and select Shut Down
to repeat the cycle.
4. Restart the device.